Download or read book Extension of the Late Holocene Sea level Record in North Carolina USA written by Jessica Kegel and published by . This book was released on 2015 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future sea-level rise will dramatically affect coastal landscapes and populations. The coast of North Carolina (USA) is particularly vulnerable to sea-level rise because its low-lying coastal plain is expansive, has a low gradient, provides significant ecosystem services and is economically important. In order to understand how future sea-level rise may affect the coast, it is necessary to study past sea-level rise. Widespread salt-marshes compose much of North Carolina's coastal system, providing an excellent environment from which to produce relative sea-level reconstructions using salt-marsh foraminifera, whose distribution is controlled by tidal elevation. Distinctive assemblage zones related to different tidal ranges can be recognized in salt-marsh foraminiferal assemblages, allowing them to be used as a proxy for reconstructing sea level as sea-level indicators. Foraminiferal assemblages from surface samples along two transects at Sand Hill Point on Cedar Island, North Carolina added to an existing modern training set of paired observations of foraminiferal assemblages and tidal elevation; these data provide local analogues for interpreting fossil assemblages using a locally weighted-weighted average (LWWA) regression model. Foraminiferal assemblages preserved in a radiocarbon-dated core of salt-marsh peat from Sand Hill Point were used to produce a continuous, high-resolution late Holocene relative sea-level reconstruction. The existing late Holocene RSL reconstruction from North Carolina is based on two sites: Sand Point on Roanoke Island and Tump Point on Cedar Island. The Sand Point record spans the last ~2200 years, but the Tump Point record spans only the last ~1000 years. Therefore, the sea-level history described from 200 BC to 1000 AD is based on only one site. The new sea-level reconstruction from Sand Hill Point extends the existing record from nearby Tump Point, NC by 1400 years, producing a high resolution, continuous record of sea-level change spanning 1500 BC - 1915 AD. This new record tests whether patterns and rates of late Holocene sea-level changes reconstructed elsewhere in North Carolina are consistent throughout the region. The calculated average rate of relative sea-level rise for Sand Hill Point of 0.7 mm/year is consistent with patterns of regional rates along the US Atlantic coast, which may be partly attributed to isostatic response to deglaciation of the Laurentide Ice Sheet.

Download or read book Late Holocene Evolution of Currituck Sound North Carolina USA written by Kelli Moran and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal evolution is an increasingly important area of study, especially with the projected rise in sea level, increase in storm intensity, and population increases along the nation's coasts. In order to predict how the coastal environment will respond to these changes in the future, we need to first understand the evolution of coastal systems in the past. Here I address the late Holocene evolution of Currituck Sound, North Carolina, by examining time periods with different barrier island and inlet configurations interpreted from core data. Chirp seismic data and 13 vibracores have been used to interpret the Holocene development of this region. Four depositional units have been defined, based on lithofacies, biofacies, geophysical, and geochronologic data. The lowermost depositional unit (Unit I) is represented by quartz sand, barren of foraminifera, and is Pleistocene in age based on an OSL age estimate of 33.7 ka. Unit II consists of slightly muddy sand that fines upward to slightly sandy mud; it is barren of foraminifera, contains rooted horizons in several cores, and is interpreted as a fresh water swamp forest deposit (radiocarbon dating provide age estimates of ca. 4000 to 2800 cal y BP). Unit III is characterized by slightly sandy mud to mud containing a calcareous foraminiferal assemblage and oyster bioherms; these characteristics indicate a back-barrier estuarine environment with high salinity (ca. 25 to 35) due to open inlets in the barrier islands to the east. Radiocarbon age estimates for Unit IV range from ca. 1700 to 500 cal y BP. The topmost unit (Unit IV) is composed of sediment with variable composition, ranging from clean quartz sand to mud, and contains foraminiferal assemblages that are generally mixed calcareous/agglutinated at the base overlain by entirely agglutinated assemblages. This unit represents the modern (post- ca. 1827), mid- to low salinity (less than 10), back-barrier lagoon with no inlets open in the barrier island. Sediment and microfossil-based paleoenvironmental and geomorphic reconstructions, including variable numbers of inlets, have been used as input into the Delft3D hydrodynamic model to understand inlet related changes to tides and currents within the Sound. This modeling indicates that impacts of inlets are very localized and only inlets in the direct vicinity of Currituck Sound (i.e., between historic Caffey's Inlet and Kill Devil Hills) have a significant impact on the water levels and currents in the study area.

Download or read book The Archaeology of Human Environmental Dynamics on the North American Atlantic Coast written by Leslie Reeder-Myers and published by University Press of Florida. This book was released on 2019-11-04 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using archaeology as a tool for understanding long-term ecological and climatic change, this volume synthesizes current knowledge about the ways Native Americans interacted with their environments along the Atlantic Coast of North America over the past 10,000 years. Leading scholars discuss how the region’s indigenous peoples grappled with significant changes to shorelines and estuaries, from sea level rise to shifting plant and animal distributions to European settlement and urbanization. Together, they provide a valuable perspective spanning millennia on the diverse marine and nearshore ecosystems of the entire Eastern Seaboard—the icy waters of Newfoundland and the Gulf of Maine, the Middle Atlantic regions of the New York Bight and the Chesapeake Bay, and the warm shallows of the St. Johns River and the Florida Keys. This broad comparative outlook brings together populations and areas previously studied in isolation. Today, the Atlantic Coast is home to tens of millions of people who inhabit ecosystems that are in dramatic decline. The research in this volume not only illuminates the past, but also provides important tools for managing coastal environments into an uncertain future. A volume in the series Society and Ecology in Island and Coastal Archaeology, edited by Victor D. Thompson

Download or read book Late Holocene Sea level Reconstructions on the Atlantic Coast of Florida USA written by Simin Liu and published by . This book was released on 2012 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Sea Level Correlation and Applications written by D.B. Scott and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: A NATO Advanced Study Institute, "Late Quaternary Sea-level Correlation and Applications", was held together with the Final Meeting of IGCP Project 200 in Halifax, Canada, 19-30 July 1987. This Volume is a collection of the NATO Keynote Papers presented at this meeting. The authors of these papers are from seven of the NATO countries - two each from France, the U. K. , Canada, and the U. S . A. , and one each from Spain, Germany and the Netherlands. With these authors, we are able to assemble work from virtually all of the world's oceans with several different approaches. The Volume is dedicated to Walter S. Newman, one of the best known and best liked sea-level workers of our time who died shortly before this Conference. This Volume contains one of his last contributions and all contributors to this Volume are honoured to be in the company of Walter's last work. There are several papers from North Atlantic countries dealing with Holocene sea level in a variety of ways. Shennan summarizes data from the U. K. and makes a preliminary effort to place the data in the context of a model. Zazo & Goy present new data from the coast of Spain and place it in a stratigraphical context. Van de P1assche re assesses previous data and adds new data to the very sea-level sensitive Dutch coast. Leatherman uses sea-level information in the Chesapeake Region to assess coastal management problems.

Download or read book Holocene Cycles written by Charles W. Finkl and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evidence for Late Holocene Sea level Rise in New England written by R. Scott Anderson and published by . This book was released on 1983 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Report written by and published by . This book was released on 1988 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quaternary Sea Level Changes written by Colin V. Murray-Wallace and published by Cambridge University Press. This book was released on 2014-01-30 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been significant changes in sea level over the past two million years, and a complete understanding of natural cycles of change as well as anthropogenic effects is imperative for future global development. This book reviews the history of research into these sea-level changes and summarises the methods and analytical approaches used to interpret evidence for sea-level changes. It provides an overview of changing climates during the Quaternary, examines processes responsible for global variability of sea-level records, and presents detailed reviews of sea-level changes for the Pleistocene and Holocene. The book concludes by discussing current trends in sea levels and likely future sea-level changes. This is an important and authoritative resource for academic researchers and graduate and advanced undergraduate students working in tectonics, stratigraphy, geomorphology, physical geography, environmental science and other aspects of Quaternary studies.

Download or read book The Ecology of Atlantic White Cedar Wetlands written by Aimlee D. Laderman and published by . This book was released on 1989 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Late Holocene Earthquake and Paleoclimate Record from Ozette Lake Washington written by Lillian Sarah Slajus and published by . This book was released on 2020 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sea Level Fluctuations Off the Carolina Coasts and Their Relation to Atmospheric Forcing written by David A. Brooks and published by . This book was released on 1977 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric pressure and wind stress fluctuations are strongly coupled to sea level fluctuations along the Carolina coasts at periods of 2.5 to 3.5 days. Sea level fluctuations in this band exhibit high coherence over a horizontal separation exceeding 500 km. Phase difference calculations indicate southward propagation of the sea level fluctuations from Beaufort to Wilmington, North Carolina; the data considered are insufficient to conclusively determine propagation direction south of Wilmington. The 2.5-3.5 day period sea level fluctuations are consistent with a theoretically expected first mode, barotropic continental shelf wave. It is concluded that continental shelf waves forced by the atmosphere contribute to the shelf and slope water circulation off North Carolina.

Download or read book Holocene Sea Level Fluctuations Magnitude and Causes written by R. F. Black and published by . This book was released on 1982 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Holocene sea and land level change on the U S southeastern Atlantic coast written by A.C. Kemp and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quaternary Sea Level Changes written by Colin V. Murray-Wallace and published by Cambridge University Press. This book was released on 2014-01-30 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important overview of Quaternary climates including detailed Pleistocene and Holocene sea-level changes, for researchers and graduate and advanced undergraduate students.

Download or read book LATE HOLOCENE SEA LEVEL CHANGE written by Cheuk-Yan Tam and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Late Holocene Sea Level Changes in the East Coast of the Malay-Peninsula" by Cheuk-yan, Tam, 譚卓欣, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: The relative sea level (RSL) history of Terengganu, east coast of the tectonically stable Malay-Peninsula, of the last 2500 years was reconstructed from dated mangrove sediments. Microfossils, particularly pollens, were used for estimating the indicative meaning of each sea-level index point. Pollen assemblages representing the top end of mangrove zone and the low end of swamp zone have an indicative meaning of 0.260.23 m and 0.330.26 m above local mean sea level respectively. The sea-level index points produced have all shown negative tendency of change, as the pollen assemblages have revealed a general environmental change towards a more freshwater condition. The more saline mangrove vegetation was graded into lagoon/riverine Nypa frusticans, or freshwater swamp Myrtaceae or Cyperaceae, depending on the distance of sampling sites from the palaeo-beach ridges. The reconstructed RSL has indicated a RSL fall to below the present mean sea level roughly since the last 1500 years, reaching a lowstand with a minimal value of -1.280.26 m at 920-750 cal. year BP, before a transgression took place between 920-280 cal. year BP, for RSL to return back to the present level. This observation departs from the steady RSL decline to present as predicted by geophysical model. This RSL fall suggests that, in addition to ocean siphoning and continental levering, the late Holocene RSL change in the far-field regions is also influenced by climatic driving forces such as Neo-glacial ice sheet expansion. The effects of these climatic factors have been recorded in some near- and intermediate- field regions. This is the first time that these effects are reported from a far-field region, the Malay-Peninsula. DOI: 10.5353/th_b5576757 Subjects: Sea level - Malay Peninsula Paleoceanography - Holocene

Download or read book Holocene Evolution of the Ocracoke Inlet Flood tide Delta Region Outer Banks North Carolina written by Caroline Faulkner Smith and published by . This book was released on 2016 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerous studies have been conducted along the Outer Banks (OBX) barrier islands of North Carolina to address Holocene climatic change using a combination of lithological, micropaleontological, stratigraphical, and geochronological data to reconstruct Holocene paleoenvironmental reconstructions. These data reveal the importance of inlet formation in the evolution of the modern barrier island chain. However, few studies have been conducted within the Ocracoke Inlet and its associated flood-tide delta (OFTD), which has been proposed to be the most stable inlet along the OBX. Detailed knowledge of the anatomy of the modern, active OFTD is necessary to further elucidate the origin and geologic evolution of Ocracoke Inlet and the OFTD region during the Holocene. Five vibracores, and ca. 100 km of seismic data (boomer and chirp) were collected from the Ocracoke Inlet flood-tide delta (OFTD). Twenty-six age estimates were obtained from the five vibracores (13 AMS radiocarbon age estimates, and 13 Optically Stimulated Luminescence-OSL age estimates). Sediments recovered are all Holocene, except a blue clay interpreted to be Pleistocene that is overlain by a basal peat (core VC1) interpreted to have formed in a freshwater riverine swamp forest (EF VI) environment at ca. 7200 cal yr BP. Sediments are predominantly fine-to-medium grained quartz sand, and contain foraminiferal assemblages composed of 41 taxa dominated by Elphidium excavatum and Ammonia parkinsoniana. Foraminiferal assemblages were used to define four biofacies. The geographical distribution of bio- and lithofacies is related to salinity and to distance from the inlet. Six environmental facies (EFs) were determined by correlating bio-, litho-, and seismic facies. Using the six EFs, three transects and five evolutionary time intervals were produced to reconstruct paleoenvironmental changes recorded in the OFTD region during the Holocene. From ca. 7200-6900 cal yr BP rising sea level caused the initial flooding of the paleo-Pamlico Creek drainage system that was characterized by a freshwater swamp environment (EF VI). Between ca. 6900-6600 cal yr BP EF VI transitioned to a high salinity estuarine environment (EF III). EF IV (undetermined, likely mid-to high salinity) estuarine environments characterized the OFTD region ca. 3400 cal yr BP. Flood-tide delta deposits (core VC3B) occurred in the study area ca. 1100 cal yr BP (during the Medieval Climate Anomaly-MCA) and Royal Shoal began to form ca. 500 cal yr BP (during the Little Ice Age-LIA), when Ocracoke Inlet was first documented in historical maps. EF V represents a sand flat/ shoal environment typical of surficial sediments, specifically near Royal Shoal (core VC2B). OFTD deposits (cores VC3B, VC5A, and VC8A) are characterized by two normal marine salinity FTD depositional environments (EF II-low energy and EF I-high energy). The OFTD region probably existed to the south of the study area when estuarine deposits characterized the study area and migrated northwards as sea-level rose.